rustc_pattern_analysis::usefulness

Struct UsefulnessCtxt

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struct UsefulnessCtxt<'a, 'p, Cx: PatCx> {
    tycx: &'a Cx,
    branch_usefulness: FxHashMap<PatId, BranchPatUsefulness<'p, Cx>>,
    complexity_limit: Option<usize>,
    complexity_level: usize,
}
Expand description

Context that provides information for usefulness checking.

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§tycx: &'a Cx

The context for type information.

§branch_usefulness: FxHashMap<PatId, BranchPatUsefulness<'p, Cx>>

Track information about the usefulness of branch patterns (see definition of “branch pattern” at BranchPatUsefulness).

§complexity_limit: Option<usize>§complexity_level: usize

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impl<'a, 'p, Cx: PatCx> UsefulnessCtxt<'a, 'p, Cx>

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fn increase_complexity_level( &mut self, complexity_add: usize, ) -> Result<(), Cx::Error>

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impl<'a, 'p, Cx> Freeze for UsefulnessCtxt<'a, 'p, Cx>

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impl<'a, 'p, Cx> RefUnwindSafe for UsefulnessCtxt<'a, 'p, Cx>
where Cx: RefUnwindSafe, <Cx as PatCx>::Ty: RefUnwindSafe, <Cx as PatCx>::PatData: RefUnwindSafe, <Cx as PatCx>::VariantIdx: RefUnwindSafe, <Cx as PatCx>::StrLit: RefUnwindSafe,

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impl<'a, 'p, Cx> Send for UsefulnessCtxt<'a, 'p, Cx>
where Cx: Sync, <Cx as PatCx>::Ty: Sync, <Cx as PatCx>::PatData: Sync, <Cx as PatCx>::VariantIdx: Sync, <Cx as PatCx>::StrLit: Sync,

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impl<'a, 'p, Cx> Sync for UsefulnessCtxt<'a, 'p, Cx>
where Cx: Sync, <Cx as PatCx>::Ty: Sync, <Cx as PatCx>::PatData: Sync, <Cx as PatCx>::VariantIdx: Sync, <Cx as PatCx>::StrLit: Sync,

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impl<'a, 'p, Cx> Unpin for UsefulnessCtxt<'a, 'p, Cx>

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impl<'a, 'p, Cx> UnwindSafe for UsefulnessCtxt<'a, 'p, Cx>
where Cx: RefUnwindSafe, <Cx as PatCx>::Ty: RefUnwindSafe, <Cx as PatCx>::PatData: RefUnwindSafe, <Cx as PatCx>::VariantIdx: RefUnwindSafe, <Cx as PatCx>::StrLit: RefUnwindSafe,

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const ALIGN: Alignment = _

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where T: 'static + ?Sized,

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Gets the TypeId of self. Read more
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where T: ?Sized,

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Converts self into a Left variant of Either<Self, Self> if into_left is true. Converts self into a Right variant of Either<Self, Self> otherwise. Read more
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Note: Most layout information is completely unstable and may even differ between compilations. The only exception is types with certain repr(...) attributes. Please see the Rust Reference's “Type Layout” chapter for details on type layout guarantees.

Size: 64 bytes